Around 1 CE, India produced roughly 32–33% of the world's GDP. By 1000 CE (close to 900 CE), India's share was about 28–29% of global GDP.
Before BC, hard to find any stats but all things pointing towards even more wealth in Indian subcontinent, India's share was about 35–40% of global GDP approximately more than 2000 years ago!
From 1200 CE, Indian civilization’s collapse started. Thankfully it’s rising again!